First description of subglacial megalineations from the late Paleozoic ice age in southern Africa

We identify late Paleozoic ice age (LPIA) subglacial megalineations from field and geospatial imagery of the Twyfelfontein area of northern Namibia, and present the results of a geomorphometric analysis of those data. Asymmetric 0.1–1.5 km-long megawhalebacks indicate a paleo-ice flow to the northwe...

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Detalles Bibliográficos
Autores principales: Andrews, Graham D., McGrady, Andrew T., Brown, Sarah R., Maynard, Shannon M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2019
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353137/
https://www.ncbi.nlm.nih.gov/pubmed/30699176
http://dx.doi.org/10.1371/journal.pone.0210673
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author Andrews, Graham D.
McGrady, Andrew T.
Brown, Sarah R.
Maynard, Shannon M.
author_facet Andrews, Graham D.
McGrady, Andrew T.
Brown, Sarah R.
Maynard, Shannon M.
author_sort Andrews, Graham D.
collection PubMed
description We identify late Paleozoic ice age (LPIA) subglacial megalineations from field and geospatial imagery of the Twyfelfontein area of northern Namibia, and present the results of a geomorphometric analysis of those data. Asymmetric 0.1–1.5 km-long megawhalebacks indicate a paleo-ice flow to the northwest. We infer that an ice stream draining the LPIA Kaokoveld ice sheet existed within the proto-Huab River valley and that was comparable to ice streams in modern Antarctica. Recognition of a paleo-ice stream in northern Namibia supports interpretations of glaciogenic sedimentary successions (Itararé Group) in southern Brazil that suggest the presence of major, terrestrial glacial outlet systems in southern Africa during the LPIA.
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spelling pubmed-63531372019-02-15 First description of subglacial megalineations from the late Paleozoic ice age in southern Africa Andrews, Graham D. McGrady, Andrew T. Brown, Sarah R. Maynard, Shannon M. PLoS One Research Article We identify late Paleozoic ice age (LPIA) subglacial megalineations from field and geospatial imagery of the Twyfelfontein area of northern Namibia, and present the results of a geomorphometric analysis of those data. Asymmetric 0.1–1.5 km-long megawhalebacks indicate a paleo-ice flow to the northwest. We infer that an ice stream draining the LPIA Kaokoveld ice sheet existed within the proto-Huab River valley and that was comparable to ice streams in modern Antarctica. Recognition of a paleo-ice stream in northern Namibia supports interpretations of glaciogenic sedimentary successions (Itararé Group) in southern Brazil that suggest the presence of major, terrestrial glacial outlet systems in southern Africa during the LPIA. Public Library of Science 2019-01-30 /pmc/articles/PMC6353137/ /pubmed/30699176 http://dx.doi.org/10.1371/journal.pone.0210673 Text en © 2019 Andrews et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Andrews, Graham D.
McGrady, Andrew T.
Brown, Sarah R.
Maynard, Shannon M.
First description of subglacial megalineations from the late Paleozoic ice age in southern Africa
title First description of subglacial megalineations from the late Paleozoic ice age in southern Africa
title_full First description of subglacial megalineations from the late Paleozoic ice age in southern Africa
title_fullStr First description of subglacial megalineations from the late Paleozoic ice age in southern Africa
title_full_unstemmed First description of subglacial megalineations from the late Paleozoic ice age in southern Africa
title_short First description of subglacial megalineations from the late Paleozoic ice age in southern Africa
title_sort first description of subglacial megalineations from the late paleozoic ice age in southern africa
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353137/
https://www.ncbi.nlm.nih.gov/pubmed/30699176
http://dx.doi.org/10.1371/journal.pone.0210673
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